How do you convert exhaust cam specs to intake? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

alkemyst · 07-15-2008, 03:50 PM

I am trying to figure out my 248/232 cam setup and degreeing it.

I went with +2.5 degs advance and the car fell on it's face. Now i am hearing 'try' 2.5 to 5 deg retard instead.

Does anyone have a write up or can tell me how to re-spec the exhaust cam to an intake so I can figure out the LSA, overlap, etc.

Thanks
Å

BoroDrifter · 07-15-2008, 08:36 PM

Four teeth to the right isn't it?
I could be completely wrong.

articdragon192 · 07-15-2008, 08:45 PM

Four teeth counter clockwise. I did ti on my S13. Ran like a champ. High end was much better. Pulled 153 whp with other bolt ons.

nicku · 07-15-2008, 09:37 PM

yep 4 teeth counter clockwise....and I am actually just looking for a exhaust cam and gonna do it on my KA now since I just port and polish it

sillyvia13 · 07-15-2008, 10:00 PM

Quote:

Originally Posted by nicku

yep 4 teeth counter clockwise....and I am actually just looking for a exhaust cam and gonna do it on my KA now since I just port and polish it

pm me...I have your cam.
any pics of this 4 teeth?

articdragon192 · 07-15-2008, 11:50 PM

It's not that hard to do. Just line up the dot to the chain the way it would go in normally as if it were an intake cam. Then rotate it counter clockwise 4 teeth. Simple.

alkemyst · 07-16-2008, 05:03 AM

Not looking for how to install...I am looking for how to convert the cam events on an exhaust cam to intake events.

The 248 exhaust cam exhaust opens 64 deg before BDC & closes 4 deg after TDC, what do these equal when moved to the intake side.

Thanks

The Stig · 07-16-2008, 08:30 AM

http://forums.nicoclub.com/zerothread?id=199829

has some info, but I can't verify it. I have a spare set of cam gears lying around, maybe I'll try this out.

alkemyst · 07-16-2008, 09:20 AM

Quote:

Originally Posted by The Stig

http://forums.nicoclub.com/zerothread?id=199829

has some info, but I can't verify it. I have a spare set of cam gears lying around, maybe I'll try this out.

I have seen that and his other threads. Some have said he is wrong, I also asked him about how the 248 +2.5 / 232 and he admitted he never really tried it.

I spoke to some others that said the 248 would actually be 1.7 degrees advanced once moved over as an intake cam.

This is why I want to get the specs on paper myself and go from there. Could be why only those not using any timing gears are actually getting the best performance.

07-15-2008, 03:50 PM	#1
alkemyst Zilvia Addict Join Date: Oct 2003 Location: Florida Age: 52 Posts: 868 Trader Rating: (0) Feedback Score: 0 reviews	How do you convert exhaust cam specs to intake? I am trying to figure out my 248/232 cam setup and degreeing it. I went with +2.5 degs advance and the car fell on it's face. Now i am hearing 'try' 2.5 to 5 deg retard instead. Does anyone have a write up or can tell me how to re-spec the exhaust cam to an intake so I can figure out the LSA, overlap, etc. Thanks Å __________________ Now my Kensai, I curse you to be a Ronin and with the my remaining spirit I, beseech Chimata-No-Kami, to have you wander through time and distance lands, seeking a new master.

07-15-2008, 08:45 PM	#3
articdragon192 Post Whore! Join Date: Jan 2005 Location: West covina Age: 38 Posts: 6,790 Trader Rating: (9) Feedback Score: 9 reviews	Four teeth counter clockwise. I did ti on my S13. Ran like a champ. High end was much better. Pulled 153 whp with other bolt ons. __________________ Need help? Click here Still stumped? Try this Can't find what you're looking for? Here you go.

07-15-2008, 09:37 PM	#4
nicku Zilvia Junkie Join Date: Aug 2007 Location: St. Cloud, MN Age: 39 Posts: 545 Trader Rating: (0) Feedback Score: 0 reviews	yep 4 teeth counter clockwise....and I am actually just looking for a exhaust cam and gonna do it on my KA now since I just port and polish it __________________

07-15-2008, 11:50 PM	#6
articdragon192 Post Whore! Join Date: Jan 2005 Location: West covina Age: 38 Posts: 6,790 Trader Rating: (9) Feedback Score: 9 reviews	It's not that hard to do. Just line up the dot to the chain the way it would go in normally as if it were an intake cam. Then rotate it counter clockwise 4 teeth. Simple. __________________ Need help? Click here Still stumped? Try this Can't find what you're looking for? Here you go.

07-16-2008, 05:03 AM	#7
alkemyst Zilvia Addict Join Date: Oct 2003 Location: Florida Age: 52 Posts: 868 Trader Rating: (0) Feedback Score: 0 reviews	Not looking for how to install...I am looking for how to convert the cam events on an exhaust cam to intake events. The 248 exhaust cam exhaust opens 64 deg before BDC & closes 4 deg after TDC, what do these equal when moved to the intake side. Thanks __________________ Now my Kensai, I curse you to be a Ronin and with the my remaining spirit I, beseech Chimata-No-Kami, to have you wander through time and distance lands, seeking a new master.

07-15-2008, 08:36 PM	#2
BoroDrifter Zilvia Member Join Date: Jan 2006 Location: St.Louis Age: 39 Posts: 193 Trader Rating: (2) Feedback Score: 2 reviews	Four teeth to the right isn't it? I could be completely wrong.

07-16-2008, 08:30 AM	#8
The Stig Leaky Injector Join Date: Oct 2005 Location: West Covina Posts: 88 Trader Rating: (1) Feedback Score: 1 reviews	http://forums.nicoclub.com/zerothread?id=199829 has some info, but I can't verify it. I have a spare set of cam gears lying around, maybe I'll try this out.